[37] | 1 | /* |
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| 2 | Copyright (C) 2006 Pedro Felzenszwalb |
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| 3 | |
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| 4 | This program is free software; you can redistribute it and/or modify |
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| 5 | it under the terms of the GNU General Public License as published by |
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| 6 | the Free Software Foundation; either version 2 of the License, or |
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| 7 | (at your option) any later version. |
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| 8 | |
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| 9 | This program is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 12 | GNU General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU General Public License |
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| 15 | along with this program; if not, write to the Free Software |
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| 16 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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| 17 | */ |
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| 18 | |
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| 19 | /* a simple image class */ |
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| 20 | |
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| 21 | #ifndef IMAGE_H |
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| 22 | #define IMAGE_H |
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| 23 | |
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| 24 | #include <cstring> |
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| 25 | |
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| 26 | template <class T> |
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| 27 | class image { |
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| 28 | public: |
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| 29 | /* create an image */ |
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| 30 | image(const int width, const int height, const bool init = true); |
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| 31 | |
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| 32 | /* delete an image */ |
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| 33 | ~image(); |
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| 34 | |
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| 35 | /* init an image */ |
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| 36 | void init(const T &val); |
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| 37 | |
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| 38 | /* copy an image */ |
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| 39 | image<T> *copy() const; |
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| 40 | |
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| 41 | /* get the width of an image. */ |
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| 42 | int width() const { return w; } |
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| 43 | |
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| 44 | /* get the height of an image. */ |
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| 45 | int height() const { return h; } |
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| 46 | |
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| 47 | /* image data. */ |
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| 48 | T *data; |
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| 49 | |
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| 50 | /* row pointers. */ |
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| 51 | T **access; |
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| 52 | |
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| 53 | private: |
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| 54 | int w, h; |
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| 55 | }; |
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| 56 | |
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| 57 | /* use imRef to access image data. */ |
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| 58 | #define imRef(im, x, y) (im->access[y][x]) |
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| 59 | |
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| 60 | /* use imPtr to get pointer to image data. */ |
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| 61 | #define imPtr(im, x, y) &(im->access[y][x]) |
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| 62 | |
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| 63 | template <class T> |
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| 64 | image<T>::image(const int width, const int height, const bool init) { |
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| 65 | w = width; |
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| 66 | h = height; |
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| 67 | data = new T[w * h]; // allocate space for image data |
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| 68 | access = new T*[h]; // allocate space for row pointers |
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| 69 | |
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| 70 | // initialize row pointers |
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| 71 | for (int i = 0; i < h; i++) |
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| 72 | access[i] = data + (i * w); |
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| 73 | |
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| 74 | if (init) |
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| 75 | memset(data, 0, w * h * sizeof(T)); |
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| 76 | } |
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| 77 | |
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| 78 | template <class T> |
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| 79 | image<T>::~image() { |
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| 80 | delete [] data; |
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| 81 | delete [] access; |
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| 82 | } |
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| 83 | |
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| 84 | template <class T> |
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| 85 | void image<T>::init(const T &val) { |
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| 86 | T *ptr = imPtr(this, 0, 0); |
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| 87 | T *end = imPtr(this, w-1, h-1); |
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| 88 | while (ptr <= end) |
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| 89 | *ptr++ = val; |
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| 90 | } |
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| 91 | |
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| 92 | |
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| 93 | template <class T> |
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| 94 | image<T> *image<T>::copy() const { |
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| 95 | image<T> *im = new image<T>(w, h, false); |
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| 96 | memcpy(im->data, data, w * h * sizeof(T)); |
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| 97 | return im; |
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| 98 | } |
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| 99 | |
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| 100 | #endif |
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| 101 | |
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